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If $f\left( x \right) =7{ x }^{ 4 }$, then $f^{ \prime }\left( x \right) =$

A

$\cfrac { 7 }{ 4 } { x }^{ 3 }$

B

${ 7x }^{ 3 }$

C

${ 21x }^{ 3 }$

D

${ 28x }^{ 3 }$

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